DE2363829C3 - Method for the one-piece injection molding of a bed bottle made of a pliable plastic - Google Patents

Description

The invention relates to a method for the one-piece injection molding of a flexible plastic existing bed bottle with a threaded bushing arranged in the neck and accommodating a sealing plug, wherein the material is injected into a mold with a core forming a receiving space and the core is removed after spraying.

In such a method known from DE-AS 12 96 335, the shape of the bed bottle is relatively elongated, so that the core of the bed bottle is still warm and the plastic is still is highly elastic, can be pulled out of the filling hole. The threaded bush closing the filling hole with the stopper is only later in a special operation in the neck of the Bed bottle inserted. In addition to the requirement of an elongated shape of the bed bottle, there is also the further operation of gluing or welding the threaded bushing required, which is time-consuming and if it is not properly glued, it can also lead to leaks.

From DE-PS 5 22 308 and US-PS 12 89 776 it is still in the production of flat rubber hot water bottles known to provide a core and this initially open after vulcanization Pull out the remaining side and then close the opening, taking care of the rubber hot water bottle the US-PS 12 89 776 is vulcanized in a threaded bushing in the neck. ,

The manufacture of rubber bed bottles is relatively time-consuming, since it involves the minimum necessary partial vulcanization a relatively long dwell time of the bed bottle in the mold is required and therefore with a mold Only a few bed bottles can be produced every hour.

In order to avoid these disadvantages, the object of the invention is to provide a method of the above to improve said type in such a way that time-saving tight and dimensionally accurate bed bottles made of plastic can be produced.

To solve this problem, the measures specified in the characterizing part of claim 1 are intended.

When producing a bed bottle made of rubber, the rubber blanks first have to be inserted into the, which is very time-consuming Mold inserted, and then after closing the hot mold under molding over a longer period of time Period to be vulcanized.

In contrast, when using injection-molded plastic, the bed bottle can be injection-molded and immediately then the mold is opened, the core is removed and the bed bottle is completely finished, with the The plastic used is much cheaper than a rubber material.

A particularly efficient production is possible if the injection molding, the pulling out of the core and the The slot is welded in a closed cycle within an injection molding tool.

With the method specified in the claim, a clean and tight weld can be achieved.
Further advantages of the invention emerge from the following description with reference to the drawing and from further subclaims. It shows

F i g. 1 shows a plan view of a bed bottle, partly in section and

F i g. 2 the line II-II g in section through a weld in accordance with F i. 1.

The bed bottle has a warming liquid receiving through a top 1 and a Underside 2 formed receiving space 3, which is screwed into a neck 4 by a plug 5 is lockable. To facilitate the filling of the receiving space 3, the neck 4 is by itself widening funnel 6 extended At the upper edge of a suspension opening 7 is provided which at the same time od to secure the plug 5 by a tape. Like. Can serve against loss.

For the secure sealing of the stopper 5 in the neck 4, a threaded bushing 8 is injected into it.

The side 9 opposite the neck 4 and at

illustrated embodiment also a part of the longitudinal sides 10 and 11 are by welding the to the top 1 and the bottom 2 arranged edge projections 12 and 13 is formed. In the preparation of the bed bottle is injected in one piece, the top 1 and the bottom 2 from the neck 4 up to the slot ends 14 and 15 contiguous and from there separated by a slot 16 are formed.

After the injection molding process, the core forming the receiving space 3 is withdrawn via this slot 16. This extraction is still possible even with a slot 16 that is narrower than the width of the core, because the plastic is highly elastic when it is still warm after pressing. Immediately after the The edge projections 12 and 13 for closing the slot 16 are injected by high-frequency welding welded together. At the same time, protruding edge parts can occur during the welding process the projections 12 and 13 are squeezed off to form a clean edge.

1 sheet of drawings

Claims (3)

Patent claims: 1. A method for the one-piece injection molding of a bed bottle made of a pliable plastic with a threaded sleeve arranged in the neck and accommodating a sealing plug, wherein the material is injected into a mold with a core forming a receiving space and the core is removed after spraying, characterized in that the threaded bushing during spraying (8) is injected into the neck (4) that one extends over at least a large part of one side (9, 10, 11) extending slot (16) is cut out for the removal of the core, wherein the The edges of the upper side (1) and the underside (2) forming the slot (16) with an edge projection (12 or 13) are provided that after pulling out the core, the opposing edge projections (12, 13) of the sides (1, 2) are welded together by means of high frequency and that with the welding process involves squeezing off protruding edge parts 2. The method according to claim 1, characterized in that the spraying, the pulling out of the Core and the welding of the slot (16) in a closed work cycle within one Injection tool takes place. 3. The method according to claim 1, characterized in that the slot (16) extends over at least a large part of the side (9) opposite the neck extends